Dudley., United Kingdom

Hi, any body got any idea why my ferns (which are normally trouble free) have gone like this? The spores on the back also seemed to have gone rotten, like brown fluff? They were planted in a narrow border down the side of some steps about 7 yrs ago and have always thrived - one thought is that they may be over packed now they have grown larger?? Many thanks for any body's thoughts.

• 5 Jul, 2014